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Derivative Financial Instruments (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
contract
Dec. 31, 2017
USD ($)
Derivative [Line Items]    
Gain on derivative $ 300  
Deferred tax asset on gain on derivative $ 71  
Cash flow hedge ineffectiveness Interest rate swap agreements are entered into with counterparties that meet established credit standards and the Corporation believes that the credit risk inherent in these contracts is not significant at December 31, 2018.  
Interest Rate Swap [Member]    
Derivative [Line Items]    
Interest rate swap notional amount $ 30,000  
Number of interest rate swap contracts | contract 4  
Interest rate swap fair value (asset) $ 1,000 $ 800
Derivative Matured [Member]    
Derivative [Line Items]    
Interest rate swap notional amount $ 20,000  
Number of interest rate swap contracts | contract 3  
Derivative, maturity date Jun. 17, 2016  
Swap Contract 3 Year 5 Million [Member]    
Derivative [Line Items]    
Interest rate swap notional amount $ 5,000  
Derivative, maturity date Jun. 17, 2019  
Swap Contract 5 Year $5 Million [Member]    
Derivative [Line Items]    
Interest rate swap notional amount $ 5,000  
Derivative, maturity date Mar. 17, 2021  
Swap Contract- 7 year $5 Million [Member]    
Derivative [Line Items]    
Interest rate swap notional amount $ 5,000  
Derivative, maturity date Mar. 17, 2023  
Swap Contract 10 Year $15 Million [Member]    
Derivative [Line Items]    
Interest rate swap notional amount $ 15,000  
Derivative, maturity date Mar. 17, 2026